Improvement in wrenches



H. W. BRETT.

/N VEN TOR.

Q1.. am @wz Wl 'T'NESSES.

UNITED STATES PATENT FEICE.

HENRY W. BRETT, oE EoSToN, MASSACHUSETTS.

IMPROVEMENT IN WRENCHES.

Specification forming part of Letters Patent No. 207,709, dated September 3, 1878 application filed February l5, 1878.

To all whom it may concern:

Be it known that I, HENRY W. BRETT, of Boston, county of Suffolk, and State of Massachusetts, have invented a certain new and useful Improved Wrench, of which the following is a speeiiication:

This improved wrench consists ot' a Shankbar, carrying at one end a loose pinion-wheel and adjustable pawl, and two jaws, one arranged to swing upon the pivot of the pinionwheel and the other to slide through the swin ging jaw, and to engage with the teeth of the pinion, all substantially as hereinafter described.

In the accompanying plate of drawings, Figures l and 2 represent vertical Sections on lines at right angles to each other.

In the drawings, A represents a handle, which is at one end of a shank-bar, B, that at the other end, between its tines a., carries a pinion-gear wheel, C, arranged to turn on a pivot, b, and to be held against turning by the interlock with its teeth of a spring-pawl block, D, which slides on the shank-bar B, and is held in said interlock by its spring c,- E and F, the two wrench-jaws.

rThe jaw E swings by its tail-piece G upon the pivot b of the gear-wheel G as a center, and the jaw F slides by its bar II in a way, J,

of the jaw F, to and from the jaw E, and by` its cog-rack d engages with the teeth of the gear-wheel C.

.With the pawl-block D released from the gear-wheel C, the jaws E and F obviously are free to be swung about the pivot b as a center, and thus to be placed for Work at either side of the shank-bar B, or at the end thereof, or at any position between the limits of their positions which is obtainable by them at either Side of the bar; and with the jaws E and F thus adjusted and held by the spring-pawl D, by pulling or pushing upon the handle, the jaw F, having the rack-bar H, will be moved `toward or away from the other jaw, E, and

thus the jaws made to grasp or be released from whatever may be between them.

In lieu of a spring-pawl block, a pawl-block arranged to bc operated by hand and'held in position or interlock with the gear-wheel C by a set-Screw or cam, Ste., can be used. t

'Havin g thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

The shank-bar B, having loose pinion-wheel Gand pawl-block D, in combination with jaw E, swinging upon the pivot b ot' the pinion C, and jaw F, sliding through jaw E and gearing with pinion-wheel C, all substantially as described, for the purpose specified.

II. W. BRETT.

Witnesses:

EDWIN W. BROWN, GEO. H. EARL. 

